Sunday, April 10, 2011

RMI skeleton/stub instantiation

In an RMI scenario, there are 2 + 1 process. 2 on server, 1 on client
Process ps1) the application jvm
Process ps2) registry process. On unix, you often start it by hand. Note PS1 and PS2 must be on the same localhost.
Process pc) client JVM

There are at least 3 java objects involved. Both skeleton and stub implement the same business interface as OB.
Object OB) the real business object
Object SK) the skeleton object
Object ST) the stub object

Let's see how these are created and linked.
1) skleton is probably instantiated by exportObject() based on the OB object, inside PS1 JVM. This is a static method.
2) After export, Skeleton's address is then registered with the registry, using rebind() or bind(), both static methods.
) UnicastRemoteObject probably has a static collection to hold OB and SK, to fend off garbage collection
) Stub is created on demand in PC, by deserializing the skeleton object

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